Biomembrane derived porous carbon film supported Au nanoparticles for highly reproducible surface-enhanced Raman scattering

Abstract

A surface-enhanced Raman scattering (SERS) substrate based on porous carbon film supported Au nanoparticles (NPs) has been successfully fabricated by using an eggshell membrane as template. The as-prepared substrate exhibited excellent sensitivity toward Rhodamine 6G (R6G) at a low concentration of 1 × 10⁻⁹ M and great reproducibility with a small relative standard deviation (RSD) (16.3%) in the intensity of the main Raman peaks of the R6G. The good SERS signals could be due to the strong electromagnetic field coupling induced by the densely assembled Au NPs and the absence of surfactant. The high reproducibility and sensitivity in SERS was also found in the detection of Sudan dye at a low concentration of 1 × 10⁻⁸ M with a RSD of less than 20%. The results not only provide a facile and green approach to an ultrasensitive SERS substrate but also represented a new strategy to utilize daily consumption waste and turned them into useful materials for inspection of the environment pollutants and food safety.